I have read that statement before. BUT, many years ago believe I also read an article explaining it really isn't true as one might think. The .22 lr has shot many people, many in accidents, many underage, drunk, unknowing people about gun safety have been shot with 1. Not sure they killed more than any other cartridge on purpose or accident.
Let's talk just about handguns, the 9mm is and has been the choice of American gangsters for decades. The gangs are the main cause of shootings in the US. The 9mm has been a caliber used in war since WW1, most police in the world and US use or have used it. It's the most or 1 of the most popular CCW calibers in the US.
I am not promoting the 9mm (luger/ parabellum) just saying, as an example when you hear about 47 people shot in Chicago, DC, LA, etc. last weekend. The 9mm is used in nearly all the shootings and has been for many years. CDC says in 2023, 46,728 gun related deaths happened in the US. ATF says 45% of recovered crime guns were 9mm in 2022. US homicides, the 9mm. .40 and 45 account for just over 50% of deaths. Yep, .22lr are popular in suicides and domestic violence but not in other crime, war, police shootings or SD.